為什麼要先閱讀指南
很多工具看起來很簡單，但實際使用時會遇到單位、時區、檔案格式、字符限制、QR Code掃描、密碼安全或正規表示式邊界等問題。指南會說明如何檢查結果、避免誤用，並把你帶到對應的工具頁面。
重要結果請再次驗證
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指南
線上工具的實用工作流指南。
學習如何使用開發者工具、寫作工具、圖片工具、計算器、轉換器和生成器，並避免常見錯誤。
如何在提交作文前統計字數
提交作文前先檢查字數、字符數、段落結構和閱讀時間，避免超過作業限制。
閱讀指南 →指南如何為社交媒體和網頁調整圖片尺寸
學習如何根據平台比例調整圖片尺寸，並在發布前檢查清晰度與檔案大小。
閱讀指南 →指南如何為連結創建並測試 QR Code
生成 QR Code後要測試掃描、檢查連結、尺寸和錯誤修正等級。
閱讀指南 →指南社交媒體文字長度限制檢查指南
發布標題、簡介和帖子前，使用字符統計工具檢查長度與可讀性。
閱讀指南 →指南如何計算百分比變化
用清晰步驟計算上漲、下降、折扣和增長率，避免公式混淆。
閱讀指南 →指南如何生成強密碼並安全儲存
生成長而唯一的密碼，並使用可信密碼管理器儲存。
閱讀指南 →指南如何在使用前測試正規表示式
用範例文字、flags、捕獲組和邊界情況測試正規表示式。
閱讀指南 →指南如何安全解碼 JWT 但不信任它
理解 JWT 解碼、簽名驗證、exp 時間戳與 token 泄露風險。
閱讀指南 →指南如何創建 SEO 友好的 URL Slug
從標題生成簡短、穩定、可讀的 URL slug，並避免關鍵詞堆砌。
閱讀指南 →指南如何計算 BMI 並理解結果
瞭解 BMI 公式、分類限制以及為什麼它不能替代醫學建議。
閱讀指南 →指南如何計算貸款月供和利息
用貸款金額、利率和期限估算月供、總利息和總還款。
閱讀指南 →指南如何為網站選擇顏色
選擇主色、記錄 HEX/RGB/HSL，並在設計中檢查對比度。
閱讀指南 →指南如何轉換 KB、MB 和 GB 檔案大小
理解十進制與二進制檔案單位，估算上傳、存儲和帶寬限制。
閱讀指南 →指南如何裁剪並壓縮網頁圖片
先裁剪再調整尺寸和壓縮，保持主體清晰並降低檔案大小。
閱讀指南 →指南發送 API 請求前如何驗證 JSON
在調用 API 前檢查 JSON 語法、必填字段、轉義格式和安全範例，減少請求失敗。
閱讀指南 →指南JSON 格式化、驗證器和 Linter 有什麼區別
比較 JSON 格式化、語法驗證和風格檢查，判斷什麼時候只需要整理可讀性，什麼時候需要更嚴格檢查。
閱讀指南 →指南如何安全除錯 Webhook Payload
用脫敏範例、JSON 格式化、字段檢查和時間戳轉換除錯 Webhook，避免泄露客戶或生產資料。
閱讀指南 →指南如何測試郵箱、URL 和 ID 的正規表示式
用正例、反例和邊界樣本測試郵箱、URL、SKU、ID 和記錄字段正規表示式。
閱讀指南 →指南JavaScript 正規表示式和 Python 正規表示式的區別
瞭解 flags、分組、Unicode、lookaround 和執行環境差異，避免瀏覽器測試結果直接套用到後端。
閱讀指南 →指南JWT exp、iat、iss、aud Claims 說明
理解 JWT 常見 claims 的含義，並區分解碼、過期時間檢查和真正的服務端驗證。
閱讀指南 →指南Base64 和 URL 編碼有什麼區別
比較 Base64 與 URL encoding，判斷文字、查詢參數、特殊符號和範例資料應該用哪種編碼。
閱讀指南 →指南Markdown 轉 HTML 預覽工作流
發布 README、檔案、支持文章和博客草稿前，先預覽 Markdown 結構、連結、列表和程式碼塊。
閱讀指南 →指南HTML、CSS 和 JavaScript 片段整理工作流
整理小段 HTML、CSS、JavaScript 程式碼，適合檔案範例、演示、工單和快速原型。
閱讀指南 →指南JPG、PNG 和 WebP 應該選哪種圖片格式
比較照片、透明背景、截圖、商品圖和網頁素材適合的圖片格式、體積和兼容性。
閱讀指南 →指南如何為 Shopify 商品頁壓縮圖片
壓縮電商商品圖時保留商品細節、顏色和信任感，同時降低頁面載入負擔。
閱讀指南 →指南如何為 Instagram、TikTok、Facebook 和 X 調整圖片尺寸
按社交平台比例、尺寸、檔案大小和裁切方式準備發布圖片。
閱讀指南 →指南如何減小圖片體積但儘量不損失可見品質
結合裁剪、尺寸調整、格式選擇和壓縮設定，在發布前檢查清晰度。
閱讀指南 →指南圖片壓縮和圖片尺寸調整有什麼區別
比較降低檔案體積、改變像素尺寸和兩者結合使用的場景。
閱讀指南 →指南電商商品列表圖片尺寸建議
規劃商品列表圖、縮略圖和詳情圖的比例、尺寸、檔案大小與一致性。
閱讀指南 →指南如何為客服工單裁剪截圖
裁剪截圖時保留錯誤資訊和必要上下文，同時減少隱私泄露風險。
閱讀指南 →指南Meta Description 字符長度指南
發布頁面前檢查 meta description 長度、可讀性、截斷風險和搜尋意圖。
閱讀指南 →指南SEO Title Tag 長度指南
檢查標題標籤長度、關鍵詞位置、品牌後綴和搜尋結果可讀性。
閱讀指南 →指南X / Twitter 字符長度指南
發布短帖前檢查連結、emoji、換行和字符限制。
閱讀指南 →指南TikTok Caption 長度指南
規劃 TikTok 文案 hook、hashtags、CTA 和可讀性，避免發布前超長。
閱讀指南 →指南YouTube 標題和描述長度指南
檢查 YouTube 標題、描述、連結、章節和搜尋摘要的長度與可讀性。
閱讀指南 →指南如何清理從 PDF 和網頁複製的文字
移除多餘空格、斷行、重複行和雜亂格式，把複製內容整理成可用草稿。
閱讀指南 →指南字數統計和字符統計應該用哪個
比較論文、SEO 摘要、社交貼文、表單、短信和平台限制適合的統計方式。
閱讀指南 →指南URL Slug 用連字符還是下劃線
比較 hyphen 和 underscore 在 URL 可讀性、一致性、SEO 習慣和長期維護上的差異。
閱讀指南 →指南百分比增加和百分比減少公式說明
理解上漲、下降、折扣、增長率和基準值，避免百分比變化公式混淆。
閱讀指南 →指南折扣計算器公式說明
學習折扣價、節省金額、稅費和最終結賬估算的公式與常見舍入問題。
閱讀指南 →指南MB 和 MiB 檔案大小有什麼區別
比較十進制 MB 與二進制 MiB，理解上傳限制、存儲面板和主機估算差異。
閱讀指南 →指南攝氏度轉華氏度公式說明
用公式和範例轉換攝氏度與華氏度，適合旅行、食譜、課堂和日常溫度檢查。
閱讀指南 →指南公制和英制單位轉換指南
比較長度、重量、速度、溫度等公制與英制單位，避免旅行、食譜和技術檔案中的單位錯誤。
閱讀指南 →指南貸款月供公式說明
理解固定利率貸款月供公式、月利率、期限、總利息以及為什麼估算會和貸款機構報價不同。
閱讀指南 →指南How to fix invalid JSON: common errors checklist
Fix invalid JSON by checking quotes, commas, brackets, escaping, arrays, objects, and safe browser-side formatting before sending data.
閱讀指南 →指南JSON escaped string vs JSON object
Compare JSON escaped strings and JSON objects so API payloads, logs, webhook examples, and nested JSON fields are easier to debug.
閱讀指南 →指南Pretty print JSON vs minify JSON
Compare pretty-printed JSON and minified JSON for debugging, documentation, config reviews, payload size, and production API workflows.
閱讀指南 →指南JSON array vs JSON object examples
Understand JSON arrays and objects with examples for lists, records, API responses, configuration, and common formatting mistakes.
閱讀指南 →指南URL query string encode and decode guide
Encode and decode URL query strings with spaces, symbols, tracking parameters, UTF-8 text, and safe link sharing checks.
閱讀指南 →指南Base64URL vs standard Base64
Compare Base64URL and standard Base64 for JWTs, URLs, tokens, padding, plus signs, slashes, and browser-safe examples.
閱讀指南 →指南Unix timestamp seconds vs milliseconds
Understand Unix timestamps in seconds and milliseconds with examples for APIs, JWT exp claims, logs, JavaScript dates, and time zones.
閱讀指南 →指南JWT decoding vs JWT verification
Compare JWT decoding and verification so authentication debugging does not confuse readable claims with trusted authorization.
閱讀指南 →指南Regex lookahead and lookbehind examples
Learn regex lookahead and lookbehind examples for matching context without consuming text, plus browser engine compatibility notes.
閱讀指南 →指南Regex greedy vs lazy quantifiers
Compare greedy and lazy regex quantifiers with examples for HTML snippets, logs, delimiters, repeated text, and safer pattern tests.
閱讀指南 →指南UUID v4 vs short random ID
Compare UUID v4 and short random IDs for databases, prototypes, test data, logs, collisions, readability, and public identifiers.
閱讀指南 →指南HTML formatter vs HTML minifier
Compare HTML formatting and minification for snippets, templates, documentation examples, page speed, and debugging readability.
閱讀指南 →指南Why format CSS before debugging layout problems
Format CSS before debugging layout problems so selectors, braces, duplicate declarations, and responsive rules are easier to inspect.
閱讀指南 →指南JavaScript minifier for snippets, not production bundles
Use a JavaScript minifier for quick snippets while understanding why production bundles need build tools, testing, source maps, and safer minification.
閱讀指南 →指南How to compress an image under 500KB
Compress an image under 500KB by adjusting dimensions, quality, format, cropping, and preview checks before upload.
閱讀指南 →指南How to compress an image under 1MB
Compress an image under 1MB for upload forms, ecommerce pages, applications, and social assets while keeping useful visual detail.
閱讀指南 →指南How to resize images for Shopify product photos
Resize images for Shopify-style product photos with consistent aspect ratio, sharp detail, thumbnails, zoom views, and file-size checks.
閱讀指南 →指南How to resize images for an Instagram carousel
Resize images for Instagram carousel posts by choosing aspect ratio, safe crop zones, consistent dimensions, and final preview checks.
閱讀指南 →指南How to resize an image for a TikTok cover
Resize a TikTok cover image with vertical framing, safe text placement, mobile preview, file-size checks, and compression tips.
閱讀指南 →指南Transparent PNG vs WebP for product images
Compare transparent PNG and WebP product images for quality, transparency, file size, browser support, and ecommerce performance.
閱讀指南 →指南Best image size for Google Shopping product feeds
Plan product image size for Google Shopping-style feeds with clarity, square crops, file weight, background, and policy-safe checks.
閱讀指南 →指南How to crop an image square without distortion
Crop an image square without stretching by choosing a center point, preserving the subject, checking edges, and exporting the right format.
閱讀指南 →指南Meta title examples by page type
Review meta title examples for tools, guides, SaaS pages, product pages, category pages, and articles with practical character checks.
閱讀指南 →指南Meta description examples by page type
Write meta descriptions for tool pages, product pages, categories, guides, SaaS pages, and articles with character checks and intent matching.
閱讀指南 →指南App Store description character count guide
Check app store description length, short descriptions, feature bullets, release notes, and platform-specific copy before submission.
閱讀指南 →指南SMS character count: GSM vs Unicode
Understand SMS character counting with GSM, Unicode, emoji, accents, segment limits, and byte-related delivery surprises.
閱讀指南 →指南How to clean AI-generated text before publishing
Clean AI-generated text by checking repetition, extra spaces, formatting, lists, headings, claims, and final word or character length.
閱讀指南 →指南How to remove duplicate lines from keyword lists
Remove duplicate lines from keyword lists, CSV drafts, outreach lists, and research notes while preserving order and checking case sensitivity.
閱讀指南 →指南How to generate URL slugs for product pages
Generate product page URL slugs with readable names, variants, separators, lowercase rules, redirects, and ecommerce SEO checks.
閱讀指南 →指南Lorem Ipsum for wireframes and mockups
Use Lorem Ipsum placeholder text for wireframes, mockups, landing page layouts, card grids, typography checks, and content planning.
閱讀指南 →指南How to count lines in CSV or log text
Count lines in CSV drafts, logs, lists, and copied text while checking empty lines, headers, malformed rows, and pasted formatting.
閱讀指南 →指南Percentage points vs percent change
Compare percentage points and percent change with examples for rates, discounts, growth, conversion, surveys, and reports.
閱讀指南 →指南Discount stacking calculation guide
Calculate stacked discounts by applying sequential percentages, tax, final price, savings, and common ecommerce checkout mistakes.
閱讀指南 →指南Tip calculator split bill examples
Use tip calculator examples for split bills, tax, service charges, rounding, group meals, and per-person totals.
閱讀指南 →指南APR vs interest rate for loan calculators
Compare APR and interest rate for loan estimates, monthly payments, fees, disclosures, and why simple calculators may differ from offers.
閱讀指南 →指南Loan term length comparison guide
Compare loan term lengths by monthly payment, total interest, repayment timeline, affordability, and scenario assumptions.
閱讀指南 →指南BMI metric vs imperial formula
Compare BMI metric and imperial formulas with unit checks, height mistakes, weight inputs, categories, and responsible interpretation.
閱讀指南 →指南Age calculator and birthday countdown guide
Calculate exact age, total days, next birthday countdowns, date assumptions, inclusive counting, and common age-calculation mistakes.
閱讀指南 →指南Time duration calculator for timesheets
Calculate work durations for timesheets with start times, end times, breaks, overnight shifts, rounding, and audit-friendly notes.
閱讀指南 →指南Days between dates: inclusive vs exclusive counting
Compare inclusive and exclusive date counting for deadlines, trips, subscriptions, projects, and common off-by-one mistakes.
閱讀指南 →指南Countdown timer for study sessions
Use a countdown timer for study sessions with focus blocks, breaks, classroom timing, task batching, and distraction checks.
閱讀指南 →指南How to use stopwatch lap times for practice
Use stopwatch lap times for typing, workouts, presentations, classroom drills, and repeatable practice measurements.
閱讀指南 →指南QR code size for print: practical checklist
Choose QR code size for print by checking scan distance, quiet zone, contrast, URL length, error correction, and phone testing.
閱讀指南 →指南How to create a QR code for a restaurant menu
Create a QR code for a restaurant menu with final URLs, scan testing, print size, fallback text, and update-friendly workflows.
閱讀指南 →指南Password length vs complexity
Compare password length and complexity for generated passwords, passphrases, symbols, password managers, and account safety.
閱讀指南 →指南Random number generator for classrooms
Use a random number generator for classroom activities, groups, raffles, examples, fairness, repeatability, and visible range settings.
閱讀指南 →指南Unit converter for recipes and cooking
Convert recipe units for metric and imperial cooking with temperature, weight, volume approximations, rounding, and ingredient caveats.
閱讀指南 →指南File size upload limit checklist
Check file size upload limits by converting units, comparing MB and MiB, compressing images, and saving original files before retrying.
閱讀指南 →指南HEX vs RGB vs HSL color values
Compare HEX, RGB, and HSL color values for CSS, design systems, opacity, lightness changes, and practical color copying.
閱讀指南 →指南How to pick a color palette for landing pages
Pick landing page colors with roles, contrast, CTA visibility, brand consistency, HEX/RGB checks, and practical design-system notes.
閱讀指南 →指南Typing test WPM and accuracy guide
Understand typing test WPM and accuracy with practice sessions, mistakes, timing, warmups, and realistic progress tracking.
閱讀指南 →